Times have really changed. Climate is changing: I can feel it and see it, and I read about in the news about hurricanes and sea level rise and glacier melts. Heating of houses with fossil fuel will be banned in .no from 2020, and I am preparing the last season, burning the leftovers in our hydrocarbon tank

https://en.wikipedia.org/wiki/Kerosene

To keep warm in future winters we will change windows, reconstruct some walls with thicker layers of mineral wool, and install an air-to-air heat exchanger for use in moderately cold days. And finally - perhaps we will even install photovoltaic panels on the roof. Locally produced and consumed non-emission electric energy sounds tempting. A question of money, of course. But photovoltaics are competitive already when compared to diesel generators. So it is a question of payback time and affordable loans.